460 PROCEEDINGS OF THE ACADEMY OF [Oct., 



brownish. Head more or less silvered. Fins uniform dark brownish.. 

 Iris dark brownish. Length 3y% inches (caudal damaged). Type. 



Two larger examples in good preservation show: Head 3f and 3^; 

 depth 3^ and 3; D. ii, 9; A. v, 41, i and v, 39, i; P. i, 15 and i, 14; 

 V. II, 7; scales about 76 or 77 in lateral line to base of caudal, and about 

 5 or 6 more on latter; about 16 scales obliquely back from origin of 

 dorsal to lateral line; about 20 scales between origin of anal and lateral 

 line; about 46 or 47 scales before dorsal; 8 scales obliquely back from 

 origin of adipose dorsal; width of head 2f and 2j^ in its length; depth 

 of head If and If over posterior margin of orbit; snout 3; eye 4^ and 

 4|; maxillary 1^ and If; mandible If and H; interorbital space 3; 

 base of dorsal 2f and 2^; least depth of caudal peduncle 3f and 3|; 

 total length of specimens (caudal damaged) 6| and 7-g- inches respec- 

 tively. Pebas, Peru. John Hauxwell. 



This species will fall within my subgenus Eucynopotaynus, with the 

 scales a little large, about 75 in the lateral line. 



Acestrorliamphus hepsetus (Cuvier). 



Xiphorhamphus hepsetus Cope, Proc. Amer. Philos. Soc. Phila., XXXIII, 

 1894 (January 5), p. 85. Brazilian province of Rio Grande do Sul. H. 

 H. Smith. 



Head 3i; depth 3f to 3f ; D. ii, 9; A. v, 24, i to v, 26. i ; scales about 

 76 in lateral line to base of caudal and several more on latter; snout 

 2| to 3^ in head; eye 4|- to 5^; maxillary If to If; interorbital space 

 5; pectoral IJ to 1^; ventral If to 2; least depth of caudal peduncle 3^^ 

 to 4 ; gill-rakers v or vi, 2 or 3 4- 8 or 9, and ii to iv. Two examples. 



SPHYR^NOCHARAX subgen. nov. 

 Type Xiphorhamphus abbreviatus Cope. 



Body rather deep, 3|- to 4. 

 [Ifupavm^ Sphyrsena; xap<^^^ Charax.) 

 Acestrorliyiiclius braohyoeplialua (Cope), 



Xiphorhamphus brachycephalus Cope, Proc. Amer. Philos. Soc. Pliila., 

 XXXIII, 1894 (January 5), p. 84, PI. 4, fig. 1. Cotj-pes, Nos. 21,728 

 (type) and 21,917, A. N. S. P. Brazilian province of Rio Grande do 

 Sul. H. H. Smith. 



Width of head 2 in its length ; interorbital space 4. Body compressed 

 and edges all more or less rounded. Head compressed. Snout con- 

 vex and a little broader than long. Teeth on palatines uniserial, 

 little smaller than those along maxillary and side of mandible where 

 compressed. Canines 4 in front of each jaw, at symphysis, not close. 

 Tongue triangularly pointed and free. Interorbital space a little 

 convex. Gill-opening forward opposite posterior nostril. Rakers 



